On 05/18/2012 06:00 PM, Jens Axboe wrote:
On 05/18/2012 08:28 AM, Asias He wrote:
Hi, List
I noticed that fio triggers reading of device serial number when fio
starts (one read) and stops (lots of read). I was wondering if fio was
reading the sysfs attribute directly in fio's code,
e.g./sys/block/vda/serial, or it triggered something which make udevd to
read it.
trace-cmd shows it seems udevd is reading:
udevd-6856 [006] xxx: function: dev_attr_show
udevd-6856 [006] xxx: function: virtblk_serial_show
Any ideas? Thanks.
Probably mtime changing of the special file inode, causing some udev
rule to attempt to re-read the id/serial. Fio doesn't read the serial
number.
OK. Thanks, Jens.
--
Asias
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